Cold Drawn Pipe

Your Professional Cold Drawn Pipe Supplier

Our goal is to become your reliable partner in the cold drawn pipe in China. Founded in 2005, Jiangsu YingNaisi is a specialized manufacturer focusing on precision cold-drawn steel tubes and hydraulic cylinders. We are committed to applying advanced manufacturing technologies and strict quality control standards to every product. Our products are quality-assured, making us a dependable choice for long-term cooperation.

Why Choose Us

Advanced Production Equipment:

The company is equipped with 18 CNC machining centers, 5 automatic welding production lines, 2 cylinder component cleaning production lines, 2 assembly production lines, 4 performance testing benches, and 2 painting production lines, with an annual output of 50,000 hydraulic cylinders.

Our Services:

We provide hydraulic cylinder installation and commissioning support: remote or on-site engineering guidance for system integration, free replacement or repair for non-human-caused damage, and regular follow-up on equipment performance and preventative maintenance recommendations.

Our Production Capacity:

Annual sales of precision cold-drawn tubing exceed 8,000 tons, and annual sales of hydraulic cylinders exceed 20,000 units.

Quality Control:

Our products are manufactured strictly according to international standards, using high-quality materials to ensure superior strength and durability. Each tube undergoes a special heat treatment process to further enhance its mechanical properties and wear resistance.

Advantages of Cold Drawn Pipe

High dimensional accuracy:

During the cold drawing process, the steel pipe is plastically deformed under the constraint of a die, allowing precise control of the outer diameter and wall thickness.

Smooth surface finish:

Cold drawn pipes have a smoother internal and external surface with lower roughness, which can significantly reduce machining allowance in downstream processes.

Improved mechanical properties:

During cold working, the metal undergoes a degree of work hardening, which increases material density. This contributes to improved wear resistance and fatigue strength.

Suitable for precision applications:

Due to the flexibility of the cold drawing process, it is well-suited for multi-specification, small-batch production.

Specification of Cold Drawn Pipe

Product Name	Cold drawn pipe
Material	Carbon Steel and Alloy Steel
Surface	Oiled, Polished, Brightness, Metallic color
Standard	ASTM A106 A53 A192 A179 A210 A519 DIN17175 1629 2391 EN10216-1 10216-2 10305-1 and GB,JIS
Grade	St35,St45,St52,E215,E235,E355,sch10,sch20,A106,A179,A192,A210,T11,T22,T12,AISI4130,SAE1010,SAE1020.etc
Technique	Cold drawn & cold rolled
Delivery Conditions	1. BK (+C)	No heat treatment after last cold forming process.
	2. BKW (+LC)	After last heat treatment there is a light finishing pass (cold drawing)
	3. BKS (+SR)	After the final cold forming process the tubes are stress relieve annealed.
	4. GBK (+A)	After the final cold forming process the tubes are annealed in a controlled atmosphere.
	5. NBK (+N)	After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere.

Features of Cold Drawn Pipe

Cold drawn seamless tubing complies with international standards such as ASTM A519, DIN 2391, and EN 10305, ensuring consistent quality and performance. Available in outer diameters ranging from 30mm to 325mm and thicknesses from 5mm to 30mm, it can be supplied in random lengths or custom-cut to specific requirements.

Surface treatments such as oiling, varnishing, or end bevelling are available to enhance corrosion resistance and facilitate installation. Additionally, protective packaging options-including waterproof wrapping, steel-strapped bundles, and wooden cases-ensure the tubing arrives in perfect condition.

Precision Seamless Cold Drawn Steel Tube

Application of Cold Drawn Pipe

Industrial machinery:

In tool extensions, machine components, frames, hydraulics, and more.

Automobile industry:

As fenders, axels, car seating frames, chassis components, roll cages, shaft tubes, and more.

Furniture making:

As frames for benches, beds, desks, chairs, displays, fixtures, and more.

Oil and energy:

As bearings, turbine parts, pumps, columns, rolls, and more.

Production Process of Cold Drawn Pipe

Piercing: The heated steel billet is fed into the piercing machine, where it is drawn through the machine’ s internal drawing equipment to form a hollow tube shape. The pierced billet is then water-cooled.

Cold drawing: The hollow steel tube after piercing is sent into the cold drawing machine, where it is drawn through a die at room temperature or near room temperature to achieve the desired dimensions and shape.

Heat treatment:

To enhance the mechanical properties of the steel tube, such as hardness, strength, and toughness, heat treatment processes such as annealing, normalizing, quenching, and tempering are typically performed.

Acid washing:

After heat treatment, the surface of the steel tube typically forms scale and other impurities. These are removed by immersing the steel tube in an acid solution to remove the oxide layer and impurities from the surface.

Anti-rust oiling:

The steel pipe surface is coated with anti-rust oil to prevent rust.

Inspection and testing:

The steel pipe undergoes mechanical property tests such as tensile testing, hardness testing, and bending testing.

Other Service of Cold Drawn Pipe

Package	Bundle packing, waterproof paper wrapping
Shipping	Sea/Express
Payment	We accept T/T and L/C. For samples or small trial orders

FAQ

Q: Are they stronger?

A: Yes, cold drawing typically increases yield strength by 10–20% compared to hot-rolled materials due to work hardening.

Q: What is the maximum size?

A: Cold drawing is generally suited for small and medium diameters, often restricted to below 127mm, though larger sizes are possible depending on manufacturing capacity.

Q: Does it have weld lines?

A: No, cold-drawn pipes are generally made from seamless raw material (mother tubes), ensuring no weak points in high-pressure applications.

Q: How should they be stored?

A: In a dry, clean, and ventilated area, off the ground, to avoid surface damage or rust.

Q: What is the typical surface finish?

A: Usually a smooth, matte finish that is often oiled to prevent corrosion.

We are one of the most professional cold drawn pipe manufacturers and suppliers in China, also support customized service. We warmly welcome you to buy bulk cold drawn pipe in stock here from our factory. Quality products and low price are available.